Primary abelian groups as modules over their endomorphism rings. Fred Richman; Elbert A. Walker — 1965 Mathematische Zeitschrift
Cotorsion Free, an Example of Relative Injectivity. Fred Richman; Elbert A. Walker — 1967 Mathematische Zeitschrift
On isotype subgroups of abelian groups John M. Irwin; Elbert A. Walker — 1961 Bulletin de la Société Mathématique de France
Group algebras of abelian groups Donna Beers; Fred Richman; Elbert A. Walker — 1983 Rendiconti del Seminario Matematico della Università di Padova